400051 is the Postal Code of Government Colony, Mumbai which is placed at Mumbai district, in Maharashtra state. PIN is expressed as Postal Index Number and it is the merge of 6 digit numeric value that You can also say Zip Code, Postal Code, and Pin Code, that explain every post offices with a unique number that is allocated into three sections means, Postal Code of Government Colony is 400051 in which the initial digit like 4 that express region of Postal Code means Mumbai and the second digit like 0 that display the sub region and the third means 0 is used as short districts means, Mumbai is the district of Government Colony and the end three digits means 051 are used to represent the Post Offices.